Does masturbating to your friend feel good?

Ai and Chiaki were hanging out in an empty classroom as always when Chiaki says "I masturbated to you yesterday."
Ai is thrown totally off guard. Supposedly she appeared in Chiaki's dream and they did... naughty... stuff.
On top of that, Chiaki requests that Ai in turn masturbates to her!
Don't you think that true friends are friends can masturbate together?

Caving in to Chiaki, Ai ends up masturbating to her...
But little did she know, that was going to be the key that opens up an entirely new side of her...